EP0686045B1 - Excipient stabilization of polypeptides treated with organic solvents - Google Patents

Excipient stabilization of polypeptides treated with organic solvents Download PDF

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EP0686045B1
EP0686045B1 EP94909647A EP94909647A EP0686045B1 EP 0686045 B1 EP0686045 B1 EP 0686045B1 EP 94909647 A EP94909647 A EP 94909647A EP 94909647 A EP94909647 A EP 94909647A EP 0686045 B1 EP0686045 B1 EP 0686045B1
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polypeptide
trehalose
formulations
excipient
hgh
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EP0686045A1 (en
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Jeffrey L. Cleland
Andrew J.S. Jones
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Genentech Inc
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Genentech Inc
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/26—Carbohydrates, e.g. sugar alcohols, amino sugars, nucleic acids, mono-, di- or oligo-saccharides; Derivatives thereof, e.g. polysorbates, sorbitan fatty acid esters or glycyrrhizin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/08—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
    • A61K47/10—Alcohols; Phenols; Salts thereof, e.g. glycerol; Polyethylene glycols [PEG]; Poloxamers; PEG/POE alkyl ethers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A61K9/1682—Processes
    • A61K9/1694—Processes resulting in granules or microspheres of the matrix type containing more than 5% of excipient

Definitions

  • This invention relates to the use of excipients to stabilize both dry and aqueous formulations of polypeptides treated with organic solvents.
  • polypeptides are sensitive to denaturation and degradation upon formulation and storage.
  • Polyols have been used to stabilize proteins and other macromolecules in aqueous formulations and in air drying or lyophilization from aqueous solutions.
  • U.S. 4,297,344 discloses stabilization of coagulation factors II and VIII, antithrombin III, and plasminogen against heat by adding selected amino acids such as glycine, alanine, hydroxyproline, glutamine, and aminobutyric acid, and a carbohydrate such as a monosaccharide, an oligosaccharide, or a sugar alcohol.
  • European Patent Application Publication No. 0 303 746 discloses stabilization of growth promoting hormones with polyols consisting of non-reducing sugars, sugar alcohols, sugar acids, pentaerythritol, lactose, water-soluble dextrans, and Ficoll, amino acids, polymers of amino acids having a charged side group at physiological pH, and choline salts.
  • European Patent Application Publication No. 0 193 917 discloses a biologically active composition for slow release characterized by a water solution of a complex between a protein and a carbohydrate.
  • U.S. 5,096,885 discloses a formulation of hGH for lyophilization containing glycine, mannitol, a non-ionic surfactant, and a buffer.
  • U.S. 4,891,319 discloses the preservation of sensitive proteins and other macromolecules in aqueous systems by drying at ambient temperatures and at atmospheric pressure in the presence of trehalose.
  • U.S. 5,149,653 discloses a method of preserving live viruses in an aqueous system by drying in a frozen state or at ambient temperature, in the presence of trehalose.
  • Polyols have also been used to stabilize dry drug formulations as, for example, in WO 8903671, filed May 5, 1989, which discloses the addition of a stabilizer such a gelatin, albumin, dextran, or trehalose to a mixture of a finely powdered drug suspended in an oily medium.
  • a stabilizer such as a gelatin, albumin, dextran, or trehalose
  • EP-A-0251 476 discloses an active agent delivery system for the controlled administration of macromolecular polypeptides which comprises a micro-suspension of water-soluble components in a polyactide matrix. Exemplified are a microsuspension of HuIFN- ⁇ , HSA and dextrose in a solution of polylactide in acetone and an emulsion of an aqueous solution of HuIFN- ⁇ , HSA and dextrose and polylactide dissolved in methylene dichloride, and controlled release devices made therefrom.
  • EP-A-0256 726 discloses a microcapsule containing TRH, its analog or a salt thereof and a method of producing the same which attains the release of the active ingredient stably for a prolonged period of time with high rates of incorporation of the active ingredient thereinto and with little possibility of excessive initial release or burst.
  • WO87/05300 discloses a process for preserving a material having water-dependant structure comprising contacting the material with an aqueous solution of a polyhydroxy compound then removing water from the material.
  • a preferred polyhydroxy compound is trehalose.
  • One aspect of the invention is a method of stabilizing a polypeptide against denaturation when treated with an organic solvent, wherein the method comprises admixing the polypeptide with trehalose.
  • Another aspect of the invention is a method of formulating a polypeptide comprising
  • Another aspect of the invention is a method of formulating a dry polypeptide for controlled release comprising
  • compositions for controlled release of a polypeptide comprising a polypeptide admixed with an excipient, the excipient being trehalose, wherein the polypeptide admixed with the excipient is treated with an organic solvent and is encapsulated in a polymer matrix.
  • polyol denotes a hydrocarbon including at least two hydroxyls bonded to carbon atoms. Polyols may include other functional groups. Examples of polyols include sugar alcohols such as mannitol and trehalose, and polyethers.
  • polyether denotes a hydrocarbon containing at least three ether bonds. Polyethers may include other functional groups. Polyethers include polyethylene glycol (PEG).
  • dry polypeptide denotes a polypeptide which has been subjected to a drying procedure such as lyophilization such that at least 50% of moisture has been removed.
  • encapsulation denotes a method for formulating a therapeutic agent such as a polypeptide into a composition useful for controlled release of the therapeutic agent.
  • encapsulating materials useful in the instant invention include polymers or copolymers of lactic and glycolic acids, or mixtures of such polymers and/or copolymers, commonly referred to as "polylactides.”
  • admixing denotes the addition of an excipient to a polypeptide of interest, such as by mixing of dry reagents or mixing of a dry reagent with a reagent in solution or suspension, or mixing of aqueous formulations of reagents.
  • excipient denotes a non-therapeutic agent added to a pharmaceutical composition to provide a desired consistency or stabilizing effect.
  • organic solvent as used herein is intended to mean any solvent containing carbon compounds.
  • exemplary organic solvents include methylene chloride, ethyl acetate, dimethyl sulfoxide, tetrahydrofuran, dimethylformamide, and ethanol.
  • Treating" a polypeptide with an organic solvent refers to mixing a dry polypeptide with an organic solvent, or making an emulsion of a polypeptide in an aqueous formulation with an organic solvent, creating an interface between a polypeptide in an aqueous formulation with an organic solvent, or extracting a polypeptide from an aqueous formulation with an organic solvent.
  • Polypeptide as used herein refers generally to peptides and proteins having more than about 10 amino acids.
  • both aqueous formulations and dry polypeptides may be admixed with an excipient to provide a stabilizing effect before treatment with an organic solvent.
  • An aqueous formulation of a polypeptide may be a polypeptide in suspension or in solution.
  • an aqueous formulation of the excipient will be added to an aqueous formulation of the polypeptide, although a dry excipient may be added, and vice-versa.
  • An aqueous formulation of a polypeptide and an excipient may be also dried by lyophilization or other means. Such dried formulations may be reconstituted into aqueous formulations before treatment with an organic solvent.
  • the mass ratio of trehalose to polypeptide will be 100:1 to 1:100, preferably 1:1 to 1:10, more preferably 1:3 to 1:4.
  • Optimal ratios are chosen on the basis of an excipient concentration which allows maximum solubility of polypeptide with minimum denaturation of the polypeptide.
  • the formulations of the instant invention may contain a preservative, a buffer or buffers, multiple excipients, such as polyethylene glycol (PEG) in addition to trehalose or a nonionic surfactant such as Tween® surfactant.
  • Non-ionic surfactants include a polysorbate, such as polysorbate 20 or 80, etc., and the poloxamers, such as poloxamer 184 or 188, Pluronic® polyols, and other ethylene/polypropylene block polymers, etc. Amounts effective to provide a stable, aqueous formulation will be used, usually in the range of from about 0.1%(w/v) to about 30%(w/v).
  • Buffers include phosphate, Tris, citrate, succinate, acetate, or histidine buffers. Most advantageously, the buffer is in the range of about 2 mM to about 100 mM. Preferred buffers include sodium succinate and potassium phosphate buffers.
  • Preservatives include phenol, benzyl alcohol, metacresol, methyl paraben, propyl paraben, benzalconium chloride, and benzethonium chloride.
  • the preferred preservatives are 0.2-0.4%(w/v) phenol and 0.7-1%(w/v) benzyl alcohol, although the type of preservative and the concentration range are not critical.
  • the formulations of the subject invention may contain other components in amounts not detracting from the preparation of stable forms and in amounts suitable for effective, safe pharmaceutical administration.
  • other pharmaceutically acceptable excipients well known to those skilled in the art may form a part of the subject compositions. These include, for example, various bulking agents, additional buffering agents, chelating agents, antioxidants, cosolvents and the like; specific examples of these could include trihydroxymethylamine salts ("Tris buffer”), and disodium edetate.
  • Polypeptides of interest include glycosylated and unglycosylated polypeptides, such as growth hormone, the interferons, and viral proteins such as HIV protease and gp120.
  • the stabilized polypeptide of the instant invention may be formulated for sustained release, especially as exposure to organic solvents is a common step in many of such preparations.
  • sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the polypeptide, which matrices are in the form of shaped articles, e.g. films, or microcapsules.
  • sustained-release matrices include polyesters, hydrogels [e.g., poly(2-hydroxyethylmethacrylate) as described by Langer, et al ., J . Biomed . Mater . Res ., 15 :167-277 (1981) and Langer, Chem .
  • polymers such as ethylene-vinyl acetate and lactic acid-glycolic acid enable release of molecules for over 100 days
  • certain hydrogels release polypeptides for shorter time periods.
  • encapsulated polypeptides remain in the body for a long time, they may denature or aggregate as a result of exposure to moisture at 37°C, resulting in a loss of biological activity and possible changes in immunogenicity. Rational strategies can be devised for polypeptide stabilization depending on the mechanism involved.
  • stabilization may be achieved by modifying sulfhydryl residues, lyophilizing from acidic solutions, controlling moisture content, using appropriate additives, and developing specific polymer matrix compositions.
  • Sustained-release ligand analogs or antibody compositions also include liposomally entrapped polypeptides.
  • Liposomes containing polypeptides are prepared by methods known per se : DE 3,218,121; Epstein, et al ., Proc . Natl . Acad . Sci . USA , 82 :3688-3692 (1985); Hwang, et al ., Proc . Natl . Acad . Sci . USA , 77 :4030-4034 (1980); EP 52,322; EP 36,676; EP 88,046; EP 143,949; EP 142,641; Japanese patent application 83-118008; U.S. Pat. No.
  • the liposomes are of the small (about 200-800 Angstroms) unilamelar type in which the lipid content is greater than about 30 mol. % cholesterol, the selected proportion being adjusted for the optimal ligand analogs therapy. Liposomes with enhanced circulation time are disclosed in U.S. Pat. No. 5,013,556.
  • hGH human growth hormone
  • hIFN- ⁇ recombinant human gamma-interferon
  • Optimal formulations were generally those that yielded the maximum soluble polypeptide concentration and the greatest recovery of native polypeptide after treatment with methylene chloride.
  • the maximum solubility of hGH in each solution was determined through the continuous addition of hGH lyophilized in ammonium bicarbonate buffer to the solution and the solubility limit was defined as the concentration at which addition of polypeptide resulted in precipitation.
  • the maximum solubility of hIFN- ⁇ was measured by adding a concentrated stock solution (264 mg/ml hIFN- ⁇ , 10 mM Na succinate, pH 5; to concentrated excipient solutions.
  • the apparent solubility limit of hIFN- ⁇ was not observed for any of the formulations at these conditions, but long term storage of the stock solution did result in precipitation as the result of a pH increase (final solution, pH 6).
  • Both polypeptide formulations were tested for stability in methylene chloride by addition of 100 ⁇ l of the polypeptide solution to 1 ml of methylene chloride. The mixture was then sonicated for 30 sec.
  • the polypeptide was extracted from the organic phase by dilution into 50 ml of excipient-free buffer (50 mM phosphate buffer, pH 8 for hGH; 10 mM succinate buffer, pH 5 for hIFN- ⁇ ). The amount of soluble polypeptide recovered was determined by ultraviolet absorbance measurements and the amount of monomeric polypeptide was assessed by size exclusion chromatography.
  • trehalose provided high hGH solubility and protection from denaturation in methylene chloride at a lower mass concentration.
  • both mannitol and trehalose were the best excipients tested.
  • mannitol was used at a mass ratio (excipient/polypeptide) of 1:3, the amount of soluble dimer in solution (as determined by size exclusion chromatography) after methylene chloride treatment was equivalent to the amount in the starting material.
  • the mannitol formulations yielded less than 60% recovery of total soluble polypeptide.
  • the trehalose formulation with a mass ratio of 1:2.5 gave an 80% recovery of total soluble polypeptide and the same fraction of soluble dimer (as determined by size exclusion chromatography, denoted native SEC-HPLC) as the starting material (Table II).
  • Excipient-free polypeptide formulations treated with methylene chloride retained 10% of the initial soluble dimer (as determined by native SEC-HPLC) after methylene chloride treatment and the total soluble polypeptide recovery was less than 60%.
  • all formulations were greater than 99% monomer before and after methylene chloride treatment.
  • the polymer used for this application was a copolymer of lactic and glycolic acids which is often referred to as poly(lactic/glycolic acid) or PLGA.
  • PLGA poly(lactic/glycolic acid)
  • the most commonly used solvent for dissolution of PLGA has been methylene chloride which provides both water immiscibility and PLGA solubility.
  • the polypeptide was added to a solution of methylene chloride containing PLGA.
  • the polypeptide was added in the form of a milled lyophilized powder.
  • the methylene chloride solution was then briefly homogenized and the solution was added to an emulsification bath. This process resulted in the extraction of methylene chloride with the concomitant formation of PLGA microspheres containing hGH.
  • the polypeptide released from these microspheres was then studied to determine the integrity of hGH after incorporation into the microspheres. Assessment of released hGH was performed by analytical size exclusion chromatography (SEC-HPLC) as well as other techniques.
  • Size exclusion chromatography indicated that hGH was released from the PLGA microspheres in the form of the native monomer, aggregates, and an unknown structure which eluted between the monomer and dimer.
  • the unknown polypeptide structure has been extensively studied and has been shown to be a conformational variant of hGH.
  • the same aggregates and conformational variant can be obtained by treatment of hGH with methylene chloride.
  • the use of methylene chloride in the process may cause denaturation and aggregation of hGH.
  • hGH lyophilized in ammonium bicarbonate was reconstituted in the desired buffer and allowed to dissolve. Undissolved polypeptide was removed by centrifugation at 13,000 rpm for 1 min.
  • the hGH concentration was 10 mg/ml.
  • the residual moisture of these formulations was not determined, but the same lyophilization cycle was used in each case.
  • Milling of lyophilized protein was performed with a pressure driven impaction mill and resulted in a fine particulate of hGH.
  • the effect of methylene chloride on hGH stability was determined by adding hGH to a solution of methylene chloride.
  • the ratio of polypeptide mass (mg) to volume of organic solvent (ml) was 40 mg/ml.
  • 100 ⁇ l of hGH in a buffered solution was added to 1.0 ml of methylene chloride to assess the effects of each buffer system on stabilization of hGH in methylene chloride.
  • the samples were sonicated for 30 seconds in a 47 kHz bath sonicator (Cole Parmer, Model 08849-00) to simulate the homogenization step in the microsphere production process.
  • the formulation stabilized hGH against denaturation in this test, it was further assessed by homogenization in methylene chloride. After sonication or homogenization, the polypeptide was extracted from the methylene chloride by dilution into a 50 fold excess of 5 mM NaHPO 4 , pH 8. The amount and quality of the polypeptide extracted in this step was determined by polypeptide concentration measurements (absorbance at 278 nm) and size exclusion HPLC (SEC-HPLC). The preferred stable formulation was one that yielded the maximum recovery of monomeric polypeptide without the formation of conformational variants or aggregates larger than dimers.
  • Methylene chloride testing of solid hGH formulations are shown in Table IV. These results indicated that the formulation which best stabilized the protein was 5 mM KPO 4 , 2.5 mg/ml trehalose. Methylene chloride testing of solid rhGH formulations Soluble Protein (Mass Fraction of Total) Formulation % Protein Recovered % Area Recovery % Trimer % Dimer % Intermediate % Monomer Milled Solids NH 4 CO 3 44.5 85.4 7.5 5.9 7.3 79.2 5 mM NaPO 4 , 85.7 100. 0.0 2.1 0.0 97.8 pH 8 5 mM NaPO 4 , 87.6 100.
  • Tween® surfactant was added to the methylene chloride phase and mixed with solid hGH (KPO 4 , pH 8).
  • the addition of Tween® surfactant to the methylene chloride phase did not improve the stability of the solid hGH (KPO 4 , pH 8) as shown in Table V.
  • the use of the surfactant, Span® 80 surfactant, in the methylene chloride phase did not improve the stability of the solid hGH (KPO 4 , pH 8).
  • Tween® surfactant in the methylene chloride phase was unsuccessful for the more stable solid hGH formulation (Mannitol, KPO 4 , pH 8). These results along with the aqueous studies indicated that Tween® surfactant is preferably not used with these formulations since it promotes aggregation and decreases the solubility of methylene chloride treated hGH.
  • Tween® surfactant in the methylene chloride phase on solid hGH stability Soluble Polypeptide (Mass Fraction of Total) Tween® in MeCl 2 % Polypeptide Recovered % Area Recovery % Trimer % Dimer % Intermediate % Monomer 0.01% Tween® 80 40.8 98.7 5.2 13.0 0.0 81.8 0.1% Tween® 80 40.8 102.9 8.0 14.0 0.0 77.9 1 % Tween® 80 53.8 97.3 7.0 11.6 0.0 81.4
  • Carboxymethylcellulose (CMC) at 0.5, 2, and 5 mg/ml was used in the aqueous formulation (10 mg/ml hGH, 10 mM NaHPO 4 , pH 8).
  • CMC at 0.5 mg/ml provided the same fraction of soluble monomer as the 10 mg/ml mannitol formulation, but the amount of polypeptide recovered in the aqueous phase was 15% lower.
  • Equal mass mixtures of CMC and mannitol (1 mg/ml and 2.5 mg/ml of each) were also attempted to provide stability at lower excipient concentrations.
  • the use of 2.5 mg/ml of each excipient provided comparable results to the 10 mg/ml mannitol formulation.
  • the 0.5 mg/ml CMC and 2.5 mg/ml each of CMC and mannitol formulations were therefore lyophilized to assess their use for microencapsulation.
  • each lyophilized material was reconstituted to the maximum solubility which was defined as the polypeptide concentration where additional polypeptide would not dissolve in the solution.
  • the maximum concentration of hGH in this experiment was achieved with the formulation lyophilized in 10 mg/ml mannitol.
  • This formulation was successfully reconstituted with 5 mM NaHPO 4 buffer, pH 8 to 200 mg/ml of hGH (200 mg/ml mannitol, 100 mM KPO 4 ) without precipitation of the polypeptide.
  • the formulation without excipients KPO 4 , pH 8) provided the second best solubility at 165 mg/ml of hGH.
  • the gelatin formulation was tested at 0.5 mg/ml gelatin, 10 mg/ml hGH, 10 mM KPO 4 , pH 8. Methylene chloride testing of this formulation yielded recovery of soluble monomer which was comparable to the 10 mg/ml mannitol formulation. Therefore, this formulation was also lyophilized for further analysis.
  • Microencapsulation of proteins in biodegradable polymers often requires the use of organic solvents to solubilize the polymer.
  • the polymer typically PLGA, polylactide (PLA), or polyglycolide (PGA)
  • PHA polylactide
  • PGA polyglycolide
  • the common organic solvents used in this process are methylene chloride and ethyl acetate. These two solvents have very different physical and chemical properties. Therefore, it was necessary to assess the stability of rhGH formulations in both solvents.
  • rhGH formulations for stability in ethyl acetate was performed by a method similar to the one used for the methylene chloride studies in the examples above.
  • Solutions of rhGH at 10 mg/ml were prepared by adding lyophilized solid rhGH (ammonium bicarbonate formulation) to each formulation.
  • the formulations were prepared with 5 mM KPO 4 , pH 8 and contained different excipients, PEG (3350 MW), mannitol, trehalose, and Tween® 20, or combinations of excipients.
  • Each rhGH formulation (100 uL) was added to 1 mL of ethyl acetate and sonicated for 30 sec to form an emulsion.
  • This emulsion was then mixed with 10 mL of 5 mM KPO 4 , pH 8 resulting in an overall dilution of rhGH by 100 fold.
  • the rhGH extracted into the buffer was analyzed by size exclusion HPLC.
  • the recovery of soluble protein and the amount of monomer recovered were generally greater than the rhGH in the same formulation treated with methylene chloride.
  • the mannitol/Tween® 20 formulation does not allow adequate solubility for a double emulsion microencapsulation process and it requires a 4:1 excipient to protein ratio (by mass)
  • the optimum formulation in these experiments was the 1 mg/mL trehalose formulation (1:10 excipient to protein ratio and high rhGH solubility).
  • the double emulsion technique (water-in-oil-in-water) for microencapsulation can only provide moderate loading of drug in the final product.
  • the drug loading is limited by the solubility of the drug in water and the volume of aqueous drug that can be added to the polymer in organic solvent . Volumes of greater than 0.5 mL of drug per gram of polymer typically result in a large initial burst of drug from the microspheres.
  • a solid drug formulation can be used in place of the aqueous drug solution.
  • a solid-in-oil-in-water process can be used to produce microspheres with high drug loading (greater then 10%) with low to moderate initial bursts.
  • the solid drug formulation used for microencapsulation must be stable in organic solvents and it must have a small size (1-5 ⁇ m) relative to the microspheres (30-100 ⁇ m) to permit high loading and low burst of the drug.
  • a small size (1-5 ⁇ m) relative to the microspheres (30-100 ⁇ m) to permit high loading and low burst of the drug.
  • spray drying A recent report by Mummenthaler et al ., Pharm. Res . 11 (1):12-20 (1994) describes the process of spray drying rhGH formulations. Since rhGH is easily denatured by surface interactions such as air-liquid interfaces, the spray drying of rhGH must be performed with surfactants in the rhGH formulation.
  • Spray dried rhGH was prepared from each of the formulations listed in Table VII. These formulations were sprayed at 5 mL/min with an inlet temperature of 90° C, an air nozzle flow rate of 600 L/hr, and a drying air rate of 36,000 L/hr. The spray dried rhGH was then collected from the filter and the cyclone units of the spray drier. The final solid usually was approximately 5 ⁇ m in diameter.
  • the spray dried rhGH powder was then tested for stability by treatment with either ethyl acetate or methylene chloride.
  • a spray dried powder mass equivalent to 10 mg of rhGH was added to 2 mL of the organic solvent in a 3 cc glass test tube.
  • the suspension was next homogenized at 10,000 rpm for 30 sec with a microfine homogenization tip. After mixing, 20 ⁇ L of the homogeneous suspension was added to 980 ⁇ L of 5 mM KPO 4 , pH 8 to extract out the protein.
  • the extracted protein concentration was determined by absorbance at 278 nm and the sample was also analyzed by size exclusion chromatography.
  • the formulation without surfactant had the greatest extent of aggregation when treated with methylene chloride. This aggregation was likely the result of the surface denaturation of rhGH during the drying process as previously observed for spray drying of rhGH.
  • Tween® 20 or PEG (3350 MW) added to the formulation, the amount of aggregation for the methylene chloride treated samples was reduced, but the overall recovery yield was still low and the monomer content was much less than 90%.
  • the same spray dried rhGH formulations containing surfactant were treated with ethyl acetate, the amount of aggregation was neglible and complete recovery of monomeric rhGH was achieved.
  • spray dried rhGH formulations consisting of trehalose and either Tween® 20 or PEG (3350 MW) were stable in ethyl acetate but did not protect the protein from denaturation in methylene chloride. Stability of spray dried solid rhGH formulations in methylene chloride and ethyl acetate.
  • Spray drying at high temperatures can have a detrimental effect on the protein and it produces protein particles which are often hollow spheres (Mummenthaler et al ., Pharm. Res. 11 (1):12-20 (1994). In addition, it is difficult to collect the small particles (1-5 ⁇ m) required for microencapsulation and the overall yield of these particles is usually very low (less than 50%).
  • An alternative to high temperature spray drying is spray freeze-drying. Spray freeze-drying of rhGH formulations results in a fine particles (2-3 ⁇ m) that readily break apart into very small solids (less than 1 ⁇ m).
  • This type of solid formulation is preferred for microencapsulation in a polymer matrix since it can provide a high loading (able to pack more solid into 30-100 ⁇ m microspheres) of homogeneously dispersed solid protein (reduced burst due to fine suspension).
  • Spray freeze-drying of rhGH was performed with the formulations listed in Table VIII. Again, a surfactant was required to stabilize rhGH during the spraying process but other proteins which are not easily denatured by surface interactions would probably not require the use of a surfactant.
  • the spray freeze-dried rhGH was prepared by pumping the formulation at 5 mL/min and operating the air nozzle at 600 L/hr as used for high temperature spray drying (Mummenthaler et al ., Pharm. Res. 11 (1):12-20 1994). The solutions were sprayed into an open metal tray of liquid nitrogen. After spraying, the tray was placed in a prechilled lyophilizer set at -30° C.
  • the liquid nitrogen was allowed to evaporate and the protein was then lyophilized (primary drying: -30° C, 13.33 Pa (100 mTorr), 52 hrs; secondary drying: 5° C, 13.33 Pa (100 mTorr), 18 hrs).
  • the final powder was then removed and placed in sealed glass vials prior to use.
  • the spray freeze-dried rhGH powder was then tested for stability by treatment with ethyl acetate and methylene chloride.
  • a spray freeze-dried powder mass equivalent to 10 mg of rhGH was added to 2 mL of the organic solvent in a 3 cc glass test tube.
  • the suspension was next homogenized at 10,000 rpm for 30 sec with a microfine homogenization tip. After mixing, 20 ⁇ L of the homogeneous suspension was added to 980 ⁇ L of 5 mM KPO 4 , pH 8 to extract out the protein.
  • the extracted protein concentration was determined by absorbance at 278 nm and the sample was also analyzed by size exclusion chromatography.
  • the spray freeze-dried formulation containing PEG was more stable in methylene chloride than the formulation containing Tween® 20 as observed above with the aqueous formulations.
  • both formulations did not yield high recovery of monomeric rhGH.
  • the trehalose in the formulations provided stabilization against organic solvent denaturation (ethyl acetate) while the surfactants stabilized the protein against surface denaturation during spray freeze-drying.
  • spray freeze dried formulations containing both trehalose and a surfactant will yield complete recovery of rhGH from ethyl acetate.

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EP94909647A 1993-02-23 1994-02-17 Excipient stabilization of polypeptides treated with organic solvents Expired - Lifetime EP0686045B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US2142193A 1993-02-23 1993-02-23
US21421 1993-02-23
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ATE175110T1 (de) * 1993-10-22 1999-01-15 Genentech Inc Verfahren zur herstellung von mikrospharen mit einer wirbelschichtstufe
DE69431358T2 (de) * 1993-10-22 2003-06-05 Genentech Inc., San Francisco Verfahren und zusammensetzungen zur mikrokapselung von adjuvantien

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9089529B2 (en) 2011-10-25 2015-07-28 Prothena Therapeutics Limited Antibody formulations and methods
US9884020B2 (en) 2011-10-25 2018-02-06 Prothena Therapeutics Limited Antibody formulations and methods for treating AL amyloidosis
US10517830B2 (en) 2011-10-25 2019-12-31 Prothena Biosciences Limited Antibody formulations and methods

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CZ212795A3 (en) 1996-02-14
ATE197550T1 (de) 2000-12-15
DE69426292D1 (de) 2000-12-21
US5753219A (en) 1998-05-19
US5804557A (en) 1998-09-08
WO1994019020A1 (en) 1994-09-01
NZ262634A (en) 1997-02-24
IL108713A (en) 1999-12-22
ES2153418T3 (es) 2001-03-01
CN1118143A (zh) 1996-03-06
AU6241294A (en) 1994-09-14
US5589167A (en) 1996-12-31
PT686045E (pt) 2001-04-30
JP3698721B2 (ja) 2005-09-21
EP0686045A1 (en) 1995-12-13
GR3035383T3 (en) 2001-05-31
JPH08507064A (ja) 1996-07-30
IL108713A0 (en) 1994-05-30
RU2143889C1 (ru) 2000-01-10
DE69426292T2 (de) 2001-05-17
DK0686045T3 (da) 2001-03-05
AU685784B2 (en) 1998-01-29
CZ296649B6 (cs) 2006-05-17
CN1108823C (zh) 2003-05-21
ZA941239B (en) 1995-08-23

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